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IR Fiber Isolators (SM Fiber)

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IR Fiber Optic Isolators with SM Fiber (1290 - 2010 nm)




  • Center Wavelength at 1310, 1550, or 2000 nm
  • Isolation up to 40 dB
  • Connectorized Unconnectorized SM Fiber
  • OEM and Build-to-Order Fiber Isolators Available

Features

  • Minimize Feedback into Optical Systems
  • Operating Ranges of 1295 - 1325 nm, 1530 - 1570 nm, 1535 - 1565 nm, or
    1990 - 2010 nm
  • At Least 0.8 m of SM Fiber on Both Sides
  • Available with 2.0 mm Narrow Key FC/PC or FC/APC Connectors, or Bare Ends
  • Designed for CW Applications
  • Each Unit is Individually Tested
  • Custom Isolators Available 

Fiber isolators protect light sources from back reflections and signals that can cause intensity noise and optical damage. Optical isolators, also known as Faraday isolators, are magneto-optic devices that preferentially transmit light in the forward direction while absorbing or displacing light propagating in the reverse direction (see the schematic below). Please see the Isolator Tutorial tab for an explanation of the operating principles of a Faraday isolator.



Isolator Schematic. A polarization independent isolator. Light is deflected away from the input path and stopped by the housing.

Thorlabs' polarization-independent IR isolators, sold on this page, are compatible with single mode (SM) fibers. In contrast, our polarization-dependent IR isolators are designed to connect to polarization-maintaining (PM) fibers. Our high-power units are built using a specialized fiber end face process that increases the maximum power. A length of 0.8 m of fiber is built in to each side of the isolator, and an arrow on the body indicates the transmission direction. In addition, each unit is tested before shipment to ensure compliance with our specifications and a complete test report comes with every serialized part.

 

1310 nm Polarization-Independent Fiber Optic Isolators


IO-H-1310x Simplified Mechanical Drawing

 

 
Item # IO-H-1310
IO-H-1310APC
IO-H-1310FC
Polarization Independent
Fiber Type SM
Center Wavelength 1310 nm
Operating Range 1290 - 1330 nm
Powera ≤300 mW (CW)
Isolation ≥29 dB
Performance Graph
(Click for Details)
Insertion Loss (Without Connectors) ≤0.70 dB
Polarization Dependent Loss (PDL) ≤0.15 dB
Return Loss (Input/Output) ≥55/50 dB
Fiber SMF-28e
  • Not recommended for high-power pulsed applications.

 1550 nm Polarization-Independent Fiber Optic Isolators

 
Item # IO-H-1550
IO-H-1550APC
IO-H-1550FC
IO-F-1550
IO-F-1550APC
IO-K-1550
Polarization Independent Independent Independent
Fiber Type SM SM SM
Center Wavelength 1550 nm 1550 nm 1550 nm
Operating Range 1530 - 1570 nm 1530 - 1570 nm 1530 - 1570 nm
Max Power 300 mW (CW)a 5 W (CW)a 10 W (CW)b
Isolation ≥29 dB 32 - 38 dB 30 - 38 dB
Performance Graph
(Click for Details)
Insertion Loss (Without Connectors) 0.5 - 0.7 dB 0.4 - 1.0 dB 0.8 - 1.5 dB
Polarization Dependent Loss (PDL) ≤0.15 dB 0.2 dB 0.25 dB
Return Loss ≥55/50 dB
(Input/Output)
>55 dB >55 dB
Fiber SMF-28e SMF-28e SMF-28e
  • Not recommended for high-power pulsed applications.
  • Ideal for high-power CW or pulsed applications.

 

2000 nm Polarization-Independent Fiber Optic Isolators

 
Item # IO-F-2000 IO-K-2000
Polarization Independent Independent
Fiber Type SM SM
Center Wavelength 2000 nm 2000 nm
Operating Range 1990 - 2010 nm 1990 - 2010 nm
Max Power 3 W (CW)a 10 W (CW)b
Isolation >25 dB >25 dB
Performance Graph
(Click for Details)
Insertion Loss 0.8 - 1.2 dB 1.4 - 1.6 dB
Polarization Dependent Loss (PDL) 0.2 dB 0.2 dB
Return Loss >50 dB >50 dB
Fiber SM2000 SM2000
  • Not recommended for high-power pulsed applications.
  • Ideal for high-power CW or pulsed applications.
 

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